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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6930) Improve replica eviction from RAM disk
Date Thu, 02 Oct 2014 13:04:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156509#comment-14156509
] 

Hudson commented on HDFS-6930:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1914 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1914/])
HDFS-6930. Improve replica eviction from RAM disk. (Arpit Agarwal) (arp: rev cb9b485075ce773f2d6189aa2f54bbc69aad4dab)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-6581.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/LazyWriteReplicaTracker.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java


> Improve replica eviction from RAM disk
> --------------------------------------
>
>                 Key: HDFS-6930
>                 URL: https://issues.apache.org/jira/browse/HDFS-6930
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: 3.0.0
>
>         Attachments: HDFS-6930.01.patch, HDFS-6930.02.patch
>
>
> The current replica eviction scheme is inefficient since it performs multiple file operations
in the context of block allocation.
> A better implementation would be asynchronous eviction when free space on RAM disk falls
below a low watermark to make block allocation faster.



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